Tool-retainer.



W. A. SMlTH.

TOOl RETMNER.

APPUCAHON HLEO ocr. I8 \an.

1,278,944. Patented July 30, 1918.

2 SHEETS-SHEET 1.

UNITED STATES PATENT OFFICE.

WILLIAM A. SMITH, OF DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCK DRILL MANUFACTURING COMPANY, OF DENVER, COLORADO, A CORPORATION OF DELA- WARE.

TOOL-RETAINER.

Application filed October 18. 1917.

To all whom it may concern:

Be it known that I, WILLIAM A. SMITH, a citizen of the United States, residing at Denver, in the county of Denver and State of ('olorado, have invented certain new and useful Improvements in Toi'il-Retainers, of which the following is a specification.

The present, invention relates to tool retaincrs, and is partieularlv intended for that type used on rock drills to hold the drill steel in the holder during the removal of the steel from the drill hole.

The oliject is to proridc a simple retainer that will not only' a-tl'ectirrlr engage the drill steel. lllll will he secnrel interlocked there with npon the rearward movement oi the drilling apparatus thereby overcoming the tendency of the tool retainer to slip or snap out of it. operative IOhll'lflll- The preferred embodiment of the invention is illustrated in the accompanying drawings. wherein Figure 1 is a side elevation of the apparatus.

Fig. .2 is a plan ricw of the same. Fig. 3 is a detail \IQW on an enlarged scale. hut showing the yoke without the drill steel therein.

Fig. 4 is a front end \'l(*\\' of thetool holder and retainer.

Fig. 5 is a sectional view on the line 5-5 of Fig. 3.

Fig. (1 is a detail sectional view through one of the ears to illustrate the shape of the opening thercthrough.

Fig. 7 is a detail sectional view indicating the manner in which the shank collar interlocks with the yoke.

Similar reference ntnnerals designate corresponding parts in all the figures of the drawings.

In the embodiment disclosed, the tool holder is designated 8, and is lll'tfll'tllllY at the front end of the drilling apparatus heing provided with cars 9, through which side bolts 10 pass that secure the holder in ilace on the apparatus. Springs 11 are ocated on these bolts 10 to provide a yielding mounting for the head or holder 8.

Said holder is also provided at its front end with oppositely extending ears 1; having their front faces formed of angularl disposed sections 13 and H and their rear faces also formed of angularly disposed sections 15 and 16, the face sections 13 being Specification of Letters Patent.

Patented July 30, 1918.

Serial No. 197,262.

parallel to the face sections 15, and the face sections it likewise bein r parallel to the face sections 16. ()peningsl are formed through the ears and taper to the centers thereof.

The tool retainer consists of a yoke 18 having a drill Stt't'l-tll!ll!tl(?lll{ loop 19 with integral rearwardl extending arms 20. The rear portions 21 of these arms are parallel to each other and are slidahly mounted in the openings 17 of the ears 1i. Said arms are provided with integral cniargzentvnts 22 forming top :ilnitinenis aeninst which are placed washers .ii the said wa luir heing adapted to lli'tlt' against the fare scrtions 1-; and it :n-coidinglr tl thicolic is swung to an inoperative or an operaiixe Piawllil'lll with respect to the tool to he retained. The rear ends of the arms are threaded to receive nuts 24, and washers 2. are located thereon and are arranged to bear against the rear face sections 1? and 16 accordingly as the yokcs is swung. Springs 26 interposed be tween the nuts ll and washers 525 serve to yicldingly hold the yoke in its rearmost p0 silion with the washers 23 ahuttccl against; the front. faces of the ears 1:2.

The drill steel to he retained may he of any desired or well known construction. In the euihmlimcnt disclosed a portion of such a steel is shown at 27, and is provided with a collar 28 that has too great a diameter to pass through the loop 19 of the tool re tainer.

\Vith swinging retainers of this general ype, there is a possibility of the retainer swinging from its operative position, as shown in full lines in Fig. 1. to its inopcratire position. as indicated in dotted lilies when strain is lu'ought against. the same. To prevent this. in the present embodiment, the rear sidc of thc steel-enihracing loop 19 is provided with a curved llange :29, the ends of which are shown at 30. This flange provides a socket 31 at the rear side of the loop 19. said socket being of suflicient diameter to loosely receive the collar 28. The ends 30 of the flange or sock-ct wall are spaced apart a distance sullicient to permit the passage of the drill steel shank, but the distance between said ends 30 is less than the diameter of the collar 28.

With this constructioin it will he evident that when the drill steel is in the position shown in Figs. 1 and 2, the retainer may be swung freely between an inoperative and an operative position with respect to said steel. If, however, the drilling apparatus is mo l rearwardly for the pur ose of extracung the tool, the collar wi 1 enter the socket 3i, and consequently the drill steel and yoke will be interlocked, so that the latter cannot accidentally swing to an inoperative position by reason of the force exerted thereagainst.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description, and it will understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what 1 claim as new, and desire to secure by Letters Patent, is:-

1. In apparatus of the character set forth, the combination with a tool holder, of a swingin tool retainer movable into and out of a position to engage a tool to prevent detachment of the same from the holder, said retainer having means that detachably andautomatically interlocks with the tool on the rearward movement of the tool retainer with respect to the tool to prevent the swinging movement of the retainer to an inoperative position.

:2. In apparatus of the character set forth, the combination with a tool holder, of a swinging tool retainer movable into and out of a position to engage a tool to prevent detachment of the same from the holder, said retainer having means that detachably and automatically interlocks with the tool on the rearward movement of the tool retainer with respect to the tool to prevent the swinging ameter of the drill shan movement of the retainer to an inoperative position, said means automatically disengagmg the tool when the tool retainer is moved forwardly with respect to the tool to permit the swinging movement of the retainer to an inoperative position.

3. In apparatus oflhe character set forth, the combination with a tool holder, of a swinging tool retaining yoke having a drill shan -embracing loop and provided with spaced stops at its rear side, the space between said stops being reater than the diand less than that of the drill shank collar.

4. In apparatus of the character set forth, the combination with Br tool holder, of a swinging tool retaining yoke having a drill shan -embracing loop and provided with a drill shank collar receiving socket in its rear side, said socket having an open side that is narrower than the diameter of the drill shank collar.

5. In apparatus of the character set forth, the combination with a tool hdldcr having a socket and spaced ears projecting on opposits sides of the socket, of a swinging tool retaining yoke having a drill shank-embracing 100 and side arms that are slidably mounte in the ears, springs for ieldingly resisting the forward movement 0 the arms with respect to the tool holder, and a drill shank-collar receiving socket in the rear side of the loop, said socket having an open side that is narrower than the diameter of the collar of a drill shank placed in the tool holder.

In testimony whereof, I afiix my signature in the presence of two witnesses.

WILLIAM A. SMITH.

Witnesses;

N. P. ALEKIGHI', R. G. Dana. 

